I'm getting rather annoyed that no matter how many times I run through any tier, I don't get to the major bosses, instead just moving onto the next tier; and I strongly want to fight the roarmulus twins to get specific gear.
How do I get to the bosses? Is there any tricks?
Also, I'm trying to be a gunner, but there doesn't seem to be any gear that increases gun damage, just the speed of which they shoot. What's the use of shooting faster if I still need to reload at the slow pace, it just doesn't really seem that shooting speed does much. Would I be better off with health giving gear?
Check the gates before hopping in. When you scroll down the gate list, you'll see special icons for bosses. Boss levels are always in the last 2 or 3 floors of a tier and the boss itself is the very last floor of the tier. Furthermore, you'll notice that there's only one icon per floor, that's because that level is always that level, and doesn't rotate like the other floors. Hover over the icons to see the level names. Each gate has one boss so far, no more. So consider which boss you want to fight, then find out which gate he's in, and hop in. I believe Roarmulus is currently in the 3rd gate from the left, off the top of my head. Something snake. Eh.
The point of shooting faster is to do damage at a faster pace. Sure, you still have the same ol' reload, but you'll reload sooner and deal damage faster. It's your choice what gear you want to take with you, and dependant on your playstyle. But whatever you do, don't get the Vitasuit, unless you want it for collecting purposes. The general lack of resistances will hinder you greatly.